The load cell is shaped and used as a regular washer and is available in sizes M20 to M72 and 7/8” to 2-3/4”. Sensors for bolt sizes smaller than M20 and 3/4”are available upon request. The BoltSafe bolt load cell is installed on the non-driven side of a bolted connection, preferably under a nut. While tightening the bolt, force is being applied to the load washer, which will result in minor deformation of the stainless steel washer. The sensor constantly measures changes in electrical resistance caused by these deformations. This data is used to determine the actual bolt load at any given moment.
Because of the rugged design of the load cells, they are able to withstand harsh conditions, such as heavy industrial environments. The load sensors can be used in contact with oil, rain, seawater, ice and temperatures up to 80 degrees Celsius. We do not recommend using the washers in conditions where the temperature is above 80 or below -40 degrees Celsius.
The calibration of the sensor is done once by BoltSafe. After that, the sensor is plug-and-play and there is no need to recalibrate when different readout methods are used. There is also no need for recalibrating the load cell during its service life, provided that it is used according to its specifications and requirements.